One of the interesting questions on the Internet is: Why is the wireless bridge farther than WIFI?
This question may be quite difficult for some people who are unfamiliar with the operation of wireless bridges and WIFI. However, the answer is very simple. That is, the comparison is wrong.
I remember someone who said that the relationship between the wireless bridge and the WIFI is like a flashlight and a light bulb. One light is concentrated and one light is divergent.
This explanation is very easy to understand, wireless bridge and WIFI is this relationship.
Wireless bridges and WIFI devices use microwaves for wireless transmission. The wireless bridges and WIFIs used in the market use wireless microwave frequencies of 2.4G and 5.8G.
The reasons why the microwave signal transmitted by the wireless bridge is farther than the transmission distance of the WIFI microwave signal are as follows:
1. Antenna
In fact, wireless bridges are also used as WIFI signal coverage, but here the questioner estimates that it is based on the wireless bridge's long-distance bridging mode and the WIFI device's signal coverage mode. Wireless bridges generally use directional antennas for long-distance bridging, so that the microwave transmission direction will be relatively concentrated; and WIFI equipment will use omnidirectional antennas for signal coverage, and the direction of microwave emission is relatively divergent; It will definitely be farther than the divergent transmission distance.
2, receiver
When a wireless bridge bridges over a long distance, a wireless bridge equipped with an antenna is also used as a receiving end, so that the signal reception rate transmitted from the transmitting end can be greatly increased. The receiving end of the WIFI signal is usually a device such as a mobile phone, a tablet computer, or a notebook. The antennas of these devices are generally built-in type and are very small and cannot receive the WIFI signals transmitted farther. Even if the mobile phone is connected to a WIFI signal, but because the signal is too weak to communicate properly, this is also the problem we encounter on weekdays. We obviously connect to a WIFI network but we can't get on the Internet.
Some people may ask, even if the antenna of the mobile phone is weak, the signal tower of the mobile network is usually far away from us. Why can the mobile phone connect to mobile network signals such as 3G and 4G?
Here we must mention the microwave frequency used by the mobile tower.
As mentioned earlier, the microwave frequencies used for wireless bridges and WIFI overlay devices are 2.4G and 5.8G for civilian use. The microwave frequencies of these two channels do not need to be applied to the country when they are used, but the mobile network signal towers are launched. The 3G and 4G signals use frequencies from 1880 to 2655 MHz. These frequencies are lower than 2.4G and 5.8G, and the low-frequency microwave signals travel farther, so the mobile phone can receive these signals. However, the use of these frequency bands must be applied to the country, go to the license before using.
3, device chip
The chip largely determines the performance of the device. The wireless bridge is mainly used for long-distance wireless transmission. Therefore, the design focus of the wireless bridge chip will be on the transmission distance, transmission bandwidth, anti-jamming and other factors; and the WIFI coverage device chip The center of gravity of the equipment will be placed on factors such as bandwidth allocation and the number of device connections.
Therefore, to do professional things to make professional, good use of steel, WIFI coverage equipment does not require too much transmission distance, after all, fear of being stunned network (bad mistakes).
These are roughly the reasons why wireless bridges have longer transmission distances than WIFIs. Although there are other minor factors, they will not be detailed here.
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